东南大学学报（自然科学版）2009，Vol.39Issue(5)：884-888,5.DOI:10.3969/j.issn.1001-0505.2009.05.003
MIMO-OFDM系统中LDPC码的改进型译码算法
Modified decoding algorithm for LDPC codes in MIMO-OFDM system
摘要
Abstract
To reduce the complexity and improve performance of decoding algorithm for LDPC(low density parity check) codes, a modified min-sum algorithm is proposed to make up the performance drawback of traditional min-sum algorithm. Based on minimum mean square error rule, the modified min-sum algorithm makes full use of advantages of normalized decoding algorithm and offset decoding algorithm to approach to belief propagation decoding algorithm. The modified min-sum algorithm is applied in MIMO-OFDM (multiple input multiple output-orthogonal frequency division multiplexing) system to reduce intercarrier interference. Simulation results show that when MIMO-OFDM system asks BER(bit error ratio) to be 10 ~(-5), the encoding gain of modified min-sum decoding algorithm can be 0. 5 dB better than traditional min-sum decoding algorithm, 0. 3 and 0. 2 dB better than normalized decoding algorithm and offset decoding algorithm respectively, and only 0. 15 dB worse than belief propagation decoding algorithm. In addition, the modified min-sum algorithm has low hardware complexity.关键词
置信传播译码算法/归一化译码算法/偏移译码算法/最小均方误差准则Key words
belief propagation decoding algorithm/ normalized decoding algorithm/ offset decoding algorithm/ minimum mean square error rule分类
信息技术与安全科学引用本文复制引用
高星,张萌,戴志生,汤佳健,徐勐..MIMO-OFDM系统中LDPC码的改进型译码算法[J].东南大学学报（自然科学版）,2009,39(5):884-888,5.基金项目
国家高技术研究发展计划(863计划)资助项目 (2007AA01Z280). （863计划）
